Wildfire severity influences offspring sex ratio in a native solitary bee.


:Although ecological disturbances can have a strong influence on pollinators through changes in habitat, virtually no studies have quantified how characteristics of wildfire influence the demography of essential pollinators. Nevertheless, evaluating this topic is critical for understanding how wildfire is linked to pollinator population dynamics, particularly given recent changes in wildfire frequency and severity in many regions of the world. In this study, we measured the demographic response of the blue orchard bee (Osmia lignaria) across a natural gradient of wildfire severity to assess how variation in wildfire characteristics influenced reproductive output, offspring sex ratio, and offspring mass. We placed nest blocks with a standardized number and sex ratio of pre-emergent adult bees across the wildfire gradient, finding some evidence for a positive but highly variable relationship between reproductive output and fire severity surrounding the nest site at both local (100 m) and landscape (750 m) scales. In addition, the production of female offspring was > 10% greater at nest sites experiencing the greatest landscape-scale fire severity relative to the lowest-severity areas. The finding that blue orchard bees biased offspring production towards the more expensive offspring sex with increasing fire severity shows a functional response to changes in habitat quality through increased density of flowering plants. Our findings indicate that burned mixed-conifer forest provides forage for the blue orchard bee across a severity gradient, and that the increase in floral resources that follows high-severity fire leads females to shift resource allocation to the more costly sex when nesting.






Galbraith SM,Cane JH,Rivers JW




Has Abstract


2021-01-03 00:00:00








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    pub_type: 杂志文章


    authors: McDowell N,Barnard H,Bond B,Hinckley T,Hubbard R,Ishii H,Köstner B,Magnani F,Marshall J,Meinzer F,Phillips N,Ryan M,Whitehead D

    更新日期:2002-06-01 00:00:00

  • The effect of proboscis and corolla tube lengths on patterns and rates of flower visitation by bumblebees.

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    authors: Inouye DW

    更新日期:1980-05-01 00:00:00

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    authors: Quattrini AM,Gómez CE,Cordes EE

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    authors: Rebelo AG,Siegfried WR

    更新日期:1985-03-01 00:00:00

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  • [Influence of SO2 on the amino acid metabolism of pea seedlings].

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    authors: Jäger HJ,Pahlich E

    更新日期:1972-06-01 00:00:00

  • Quantification of plasticity of plant traits in response to light intensity: comparing phenotypes at a common weight.

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    authors: Rice SA,Bazzaz FA

    更新日期:1989-03-01 00:00:00

  • Fundamental limits to the accuracy of deuterium isotopes for identifying the spatial origin of migratory animals.

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    authors: Farmer A,Cade BS,Torres-Dowdall J

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  • Dynamics of dissolved oxygen isotopic ratios: a transient model to quantify primary production, community respiration, and air-water exchange in aquatic ecosystems.

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    authors: Venkiteswaran JJ,Wassenaar LI,Schiff SL

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    authors: González-Megías A,Sánchez-Piñero F

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    authors: Wise DH

    更新日期:1983-04-01 00:00:00

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    authors: Grace JB,Wetzel RG

    更新日期:1981-08-01 00:00:00

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    authors: Tieszen LL,Senyimba MM,Imbamba SK,Troughton JH

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    authors: Poore AG,Graba-Landry A,Favret M,Sheppard Brennand H,Byrne M,Dworjanyn SA

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  • Delayed density dependence and oscillatory population dynamics in overlapping-generation systems of a seed beetle Callosobruchus chinensis: matrix population model.

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  • Photosynthesis in relation to leaf nitrogen and phosphorus content in Zimbabwean trees.

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    authors: Englund G,Johansson F,Olsson TI

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    更新日期:2016-01-01 00:00:00